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Diffstat (limited to 'drivers/clk/samsung/clk-cpu.c')
| -rw-r--r-- | drivers/clk/samsung/clk-cpu.c | 727 |
1 files changed, 727 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c new file mode 100644 index 000000000000..300f8d5d3c48 --- /dev/null +++ b/drivers/clk/samsung/clk-cpu.c @@ -0,0 +1,727 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2014 Samsung Electronics Co., Ltd. + * Author: Thomas Abraham <thomas.ab@samsung.com> + * + * Copyright (c) 2015 Samsung Electronics Co., Ltd. + * Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> + * + * This file contains the utility function to register CPU clock for Samsung + * Exynos platforms. A CPU clock is defined as a clock supplied to a CPU or a + * group of CPUs. The CPU clock is typically derived from a hierarchy of clock + * blocks which includes mux and divider blocks. There are a number of other + * auxiliary clocks supplied to the CPU domain such as the debug blocks and AXI + * clock for CPU domain. The rates of these auxiliary clocks are related to the + * CPU clock rate and this relation is usually specified in the hardware manual + * of the SoC or supplied after the SoC characterization. + * + * The below implementation of the CPU clock allows the rate changes of the CPU + * clock and the corresponding rate changes of the auxiliary clocks of the CPU + * domain. The platform clock driver provides a clock register configuration + * for each configurable rate which is then used to program the clock hardware + * registers to achieve a fast coordinated rate change for all the CPU domain + * clocks. + * + * On a rate change request for the CPU clock, the rate change is propagated + * up to the PLL supplying the clock to the CPU domain clock blocks. While the + * CPU domain PLL is reconfigured, the CPU domain clocks are driven using an + * alternate clock source. If required, the alternate clock source is divided + * down in order to keep the output clock rate within the previous OPP limits. + */ + +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/clk-provider.h> + +#include "clk.h" +#include "clk-cpu.h" + +struct exynos_cpuclk; + +typedef int (*exynos_rate_change_fn_t)(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk); + +/** + * struct exynos_cpuclk_regs - Register offsets for CPU related clocks + * @mux_sel: offset of CPU MUX_SEL register (for selecting MUX clock parent) + * @mux_stat: offset of CPU MUX_STAT register (for checking MUX clock status) + * @div_cpu0: offset of CPU DIV0 register (for modifying divider values) + * @div_cpu1: offset of CPU DIV1 register (for modifying divider values) + * @div_stat_cpu0: offset of CPU DIV0_STAT register (for checking DIV status) + * @div_stat_cpu1: offset of CPU DIV1_STAT register (for checking DIV status) + * @mux: offset of MUX register for choosing CPU clock source + * @divs: offsets of DIV registers (ACLK, ATCLK, PCLKDBG and PERIPHCLK) + */ +struct exynos_cpuclk_regs { + u32 mux_sel; + u32 mux_stat; + u32 div_cpu0; + u32 div_cpu1; + u32 div_stat_cpu0; + u32 div_stat_cpu1; + + u32 mux; + u32 divs[4]; +}; + +/** + * struct exynos_cpuclk_chip - Chip specific data for CPU clock + * @regs: register offsets for CPU related clocks + * @pre_rate_cb: callback to run before CPU clock rate change + * @post_rate_cb: callback to run after CPU clock rate change + */ +struct exynos_cpuclk_chip { + const struct exynos_cpuclk_regs *regs; + exynos_rate_change_fn_t pre_rate_cb; + exynos_rate_change_fn_t post_rate_cb; +}; + +/** + * struct exynos_cpuclk - information about clock supplied to a CPU core + * @hw: handle between CCF and CPU clock + * @alt_parent: alternate parent clock to use when switching the speed + * of the primary parent clock + * @base: start address of the CPU clock registers block + * @lock: cpu clock domain register access lock + * @cfg: cpu clock rate configuration data + * @num_cfgs: number of array elements in @cfg array + * @clk_nb: clock notifier registered for changes in clock speed of the + * primary parent clock + * @flags: configuration flags for the CPU clock + * @chip: chip-specific data for the CPU clock + * + * This structure holds information required for programming the CPU clock for + * various clock speeds. + */ +struct exynos_cpuclk { + struct clk_hw hw; + const struct clk_hw *alt_parent; + void __iomem *base; + spinlock_t *lock; + const struct exynos_cpuclk_cfg_data *cfg; + const unsigned long num_cfgs; + struct notifier_block clk_nb; + unsigned long flags; + const struct exynos_cpuclk_chip *chip; +}; + +/* ---- Common code --------------------------------------------------------- */ + +/* Divider stabilization time, msec */ +#define MAX_STAB_TIME 10 +#define MAX_DIV 8 +#define DIV_MASK GENMASK(2, 0) +#define DIV_MASK_ALL GENMASK(31, 0) +#define MUX_MASK GENMASK(2, 0) + +/* + * Helper function to wait until divider(s) have stabilized after the divider + * value has changed. + */ +static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME); + + do { + if (!(readl(div_reg) & mask)) + return; + } while (time_before(jiffies, timeout)); + + if (!(readl(div_reg) & mask)) + return; + + pr_err("%s: timeout in divider stabilization\n", __func__); +} + +/* + * Helper function to wait until mux has stabilized after the mux selection + * value was changed. + */ +static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos, + unsigned long mask, unsigned long mux_value) +{ + unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME); + + do { + if (((readl(mux_reg) >> mux_pos) & mask) == mux_value) + return; + } while (time_before(jiffies, timeout)); + + if (((readl(mux_reg) >> mux_pos) & mask) == mux_value) + return; + + pr_err("%s: re-parenting mux timed-out\n", __func__); +} + +/* + * Helper function to set the 'safe' dividers for the CPU clock. The parameters + * div and mask contain the divider value and the register bit mask of the + * dividers to be programmed. + */ +static void exynos_set_safe_div(struct exynos_cpuclk *cpuclk, unsigned long div, + unsigned long mask) +{ + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + void __iomem *base = cpuclk->base; + unsigned long div0; + + div0 = readl(base + regs->div_cpu0); + div0 = (div0 & ~mask) | (div & mask); + writel(div0, base + regs->div_cpu0); + wait_until_divider_stable(base + regs->div_stat_cpu0, mask); +} + +/* ---- Exynos 3/4/5 -------------------------------------------------------- */ + +#define E4210_DIV0_RATIO0_MASK GENMASK(2, 0) +#define E4210_DIV1_HPM_MASK GENMASK(6, 4) +#define E4210_DIV1_COPY_MASK GENMASK(2, 0) +#define E4210_MUX_HPM_MASK BIT(20) +#define E4210_DIV0_ATB_SHIFT 16 +#define E4210_DIV0_ATB_MASK (DIV_MASK << E4210_DIV0_ATB_SHIFT) + +static const struct exynos_cpuclk_regs e4210_cpuclk_regs = { + .mux_sel = 0x200, + .mux_stat = 0x400, + .div_cpu0 = 0x500, + .div_cpu1 = 0x504, + .div_stat_cpu0 = 0x600, + .div_stat_cpu1 = 0x604, +}; + +/* handler for pre-rate change notification from parent clock */ +static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + void __iomem *base = cpuclk->base; + unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent); + unsigned long div0, div1 = 0, mux_reg; + unsigned long flags; + + /* find out the divider values to use for clock data */ + while ((cfg_data->prate * 1000) != ndata->new_rate) { + if (cfg_data->prate == 0) + return -EINVAL; + cfg_data++; + } + + spin_lock_irqsave(cpuclk->lock, flags); + + /* + * For the selected PLL clock frequency, get the pre-defined divider + * values. If the clock for sclk_hpm is not sourced from apll, then + * the values for DIV_COPY and DIV_HPM dividers need not be set. + */ + div0 = cfg_data->div0; + if (cpuclk->flags & CLK_CPU_HAS_DIV1) { + div1 = cfg_data->div1; + if (readl(base + regs->mux_sel) & E4210_MUX_HPM_MASK) + div1 = readl(base + regs->div_cpu1) & + (E4210_DIV1_HPM_MASK | E4210_DIV1_COPY_MASK); + } + + /* + * If the old parent clock speed is less than the clock speed of + * the alternate parent, then it should be ensured that at no point + * the armclk speed is more than the old_prate until the dividers are + * set. Also workaround the issue of the dividers being set to lower + * values before the parent clock speed is set to new lower speed + * (this can result in too high speed of armclk output clocks). + */ + if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) { + unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate); + unsigned long alt_div, alt_div_mask = DIV_MASK; + + alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1; + WARN_ON(alt_div >= MAX_DIV); + + if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) { + /* + * In Exynos4210, ATB clock parent is also mout_core. So + * ATB clock also needs to be maintained at safe speed. + */ + alt_div |= E4210_DIV0_ATB_MASK; + alt_div_mask |= E4210_DIV0_ATB_MASK; + } + exynos_set_safe_div(cpuclk, alt_div, alt_div_mask); + div0 |= alt_div; + } + + /* select sclk_mpll as the alternate parent */ + mux_reg = readl(base + regs->mux_sel); + writel(mux_reg | (1 << 16), base + regs->mux_sel); + wait_until_mux_stable(base + regs->mux_stat, 16, MUX_MASK, 2); + + /* alternate parent is active now. set the dividers */ + writel(div0, base + regs->div_cpu0); + wait_until_divider_stable(base + regs->div_stat_cpu0, DIV_MASK_ALL); + + if (cpuclk->flags & CLK_CPU_HAS_DIV1) { + writel(div1, base + regs->div_cpu1); + wait_until_divider_stable(base + regs->div_stat_cpu1, + DIV_MASK_ALL); + } + + spin_unlock_irqrestore(cpuclk->lock, flags); + return 0; +} + +/* handler for post-rate change notification from parent clock */ +static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + void __iomem *base = cpuclk->base; + unsigned long div = 0, div_mask = DIV_MASK; + unsigned long mux_reg; + unsigned long flags; + + /* find out the divider values to use for clock data */ + if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) { + while ((cfg_data->prate * 1000) != ndata->new_rate) { + if (cfg_data->prate == 0) + return -EINVAL; + cfg_data++; + } + } + + spin_lock_irqsave(cpuclk->lock, flags); + + /* select mout_apll as the alternate parent */ + mux_reg = readl(base + regs->mux_sel); + writel(mux_reg & ~(1 << 16), base + regs->mux_sel); + wait_until_mux_stable(base + regs->mux_stat, 16, MUX_MASK, 1); + + if (cpuclk->flags & CLK_CPU_NEEDS_DEBUG_ALT_DIV) { + div |= (cfg_data->div0 & E4210_DIV0_ATB_MASK); + div_mask |= E4210_DIV0_ATB_MASK; + } + + exynos_set_safe_div(cpuclk, div, div_mask); + spin_unlock_irqrestore(cpuclk->lock, flags); + return 0; +} + +/* ---- Exynos5433 ---------------------------------------------------------- */ + +static const struct exynos_cpuclk_regs e5433_cpuclk_regs = { + .mux_sel = 0x208, + .mux_stat = 0x408, + .div_cpu0 = 0x600, + .div_cpu1 = 0x604, + .div_stat_cpu0 = 0x700, + .div_stat_cpu1 = 0x704, +}; + +/* handler for pre-rate change notification from parent clock */ +static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + void __iomem *base = cpuclk->base; + unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent); + unsigned long div0, div1 = 0, mux_reg; + unsigned long flags; + + /* find out the divider values to use for clock data */ + while ((cfg_data->prate * 1000) != ndata->new_rate) { + if (cfg_data->prate == 0) + return -EINVAL; + cfg_data++; + } + + spin_lock_irqsave(cpuclk->lock, flags); + + /* + * For the selected PLL clock frequency, get the pre-defined divider + * values. + */ + div0 = cfg_data->div0; + div1 = cfg_data->div1; + + /* + * If the old parent clock speed is less than the clock speed of + * the alternate parent, then it should be ensured that at no point + * the armclk speed is more than the old_prate until the dividers are + * set. Also workaround the issue of the dividers being set to lower + * values before the parent clock speed is set to new lower speed + * (this can result in too high speed of armclk output clocks). + */ + if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) { + unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate); + unsigned long alt_div, alt_div_mask = DIV_MASK; + + alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1; + WARN_ON(alt_div >= MAX_DIV); + + exynos_set_safe_div(cpuclk, alt_div, alt_div_mask); + div0 |= alt_div; + } + + /* select the alternate parent */ + mux_reg = readl(base + regs->mux_sel); + writel(mux_reg | 1, base + regs->mux_sel); + wait_until_mux_stable(base + regs->mux_stat, 0, MUX_MASK, 2); + + /* alternate parent is active now. set the dividers */ + writel(div0, base + regs->div_cpu0); + wait_until_divider_stable(base + regs->div_stat_cpu0, DIV_MASK_ALL); + + writel(div1, base + regs->div_cpu1); + wait_until_divider_stable(base + regs->div_stat_cpu1, DIV_MASK_ALL); + + spin_unlock_irqrestore(cpuclk->lock, flags); + return 0; +} + +/* handler for post-rate change notification from parent clock */ +static int exynos5433_cpuclk_post_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + void __iomem *base = cpuclk->base; + unsigned long div = 0, div_mask = DIV_MASK; + unsigned long mux_reg; + unsigned long flags; + + spin_lock_irqsave(cpuclk->lock, flags); + + /* select apll as the alternate parent */ + mux_reg = readl(base + regs->mux_sel); + writel(mux_reg & ~1, base + regs->mux_sel); + wait_until_mux_stable(base + regs->mux_stat, 0, MUX_MASK, 1); + + exynos_set_safe_div(cpuclk, div, div_mask); + spin_unlock_irqrestore(cpuclk->lock, flags); + return 0; +} + +/* ---- Exynos850 ----------------------------------------------------------- */ + +#define E850_DIV_RATIO_MASK GENMASK(3, 0) +#define E850_BUSY_MASK BIT(16) + +/* Max time for divider or mux to stabilize, usec */ +#define E850_DIV_MUX_STAB_TIME 100 +/* OSCCLK clock rate, Hz */ +#define E850_OSCCLK (26 * MHZ) + +static const struct exynos_cpuclk_regs e850cl0_cpuclk_regs = { + .mux = 0x100c, + .divs = { 0x1800, 0x1808, 0x180c, 0x1810 }, +}; + +static const struct exynos_cpuclk_regs e850cl1_cpuclk_regs = { + .mux = 0x1000, + .divs = { 0x1800, 0x1808, 0x180c, 0x1810 }, +}; + +/* + * Set alternate parent rate to "rate" value or less. + * + * rate: Desired alt_parent rate, or 0 for max alt_parent rate + * + * Exynos850 doesn't have CPU clock divider in CMU_CPUCLx block (CMUREF divider + * doesn't affect CPU speed). So CPUCLx_SWITCH divider from CMU_TOP is used + * instead to adjust alternate parent speed. + * + * It's possible to use clk_set_max_rate() instead of this function, but it + * would set overly pessimistic rate values to alternate parent. + */ +static int exynos850_alt_parent_set_max_rate(const struct clk_hw *alt_parent, + unsigned long rate) +{ + struct clk_hw *clk_div, *clk_divp; + unsigned long divp_rate, div_rate, div; + int ret; + + /* Divider from CMU_TOP */ + clk_div = clk_hw_get_parent(alt_parent); + if (!clk_div) + return -ENOENT; + /* Divider's parent from CMU_TOP */ + clk_divp = clk_hw_get_parent(clk_div); + if (!clk_divp) + return -ENOENT; + /* Divider input rate */ + divp_rate = clk_hw_get_rate(clk_divp); + if (!divp_rate) + return -EINVAL; + + /* Calculate new alt_parent rate for integer divider value */ + if (rate == 0) + div = 1; + else + div = DIV_ROUND_UP(divp_rate, rate); + div_rate = DIV_ROUND_UP(divp_rate, div); + WARN_ON(div >= MAX_DIV); + + /* alt_parent will propagate this change up to the divider */ + ret = clk_set_rate(alt_parent->clk, div_rate); + if (ret) + return ret; + udelay(E850_DIV_MUX_STAB_TIME); + + return 0; +} + +/* Handler for pre-rate change notification from parent clock */ +static int exynos850_cpuclk_pre_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const unsigned int shifts[4] = { 16, 12, 8, 4 }; /* E850_CPU_DIV0() */ + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg; + const struct clk_hw *alt_parent = cpuclk->alt_parent; + void __iomem *base = cpuclk->base; + unsigned long alt_prate = clk_hw_get_rate(alt_parent); + unsigned long flags; + u32 mux_reg; + size_t i; + int ret; + + /* No actions are needed when switching to or from OSCCLK parent */ + if (ndata->new_rate == E850_OSCCLK || ndata->old_rate == E850_OSCCLK) + return 0; + + /* Find out the divider values to use for clock data */ + while ((cfg_data->prate * 1000) != ndata->new_rate) { + if (cfg_data->prate == 0) + return -EINVAL; + cfg_data++; + } + + /* + * If the old parent clock speed is less than the clock speed of + * the alternate parent, then it should be ensured that at no point + * the armclk speed is more than the old_prate until the dividers are + * set. Also workaround the issue of the dividers being set to lower + * values before the parent clock speed is set to new lower speed + * (this can result in too high speed of armclk output clocks). + */ + if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) { + unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate); + + ret = exynos850_alt_parent_set_max_rate(alt_parent, tmp_rate); + if (ret) + return ret; + } + + spin_lock_irqsave(cpuclk->lock, flags); + + /* Select the alternate parent */ + mux_reg = readl(base + regs->mux); + writel(mux_reg | 1, base + regs->mux); + wait_until_mux_stable(base + regs->mux, 16, 1, 0); + + /* Alternate parent is active now. Set the dividers */ + for (i = 0; i < ARRAY_SIZE(shifts); ++i) { + unsigned long div = (cfg_data->div0 >> shifts[i]) & 0xf; + u32 val; + + val = readl(base + regs->divs[i]); + val = (val & ~E850_DIV_RATIO_MASK) | div; + writel(val, base + regs->divs[i]); + wait_until_divider_stable(base + regs->divs[i], E850_BUSY_MASK); + } + + spin_unlock_irqrestore(cpuclk->lock, flags); + + return 0; +} + +/* Handler for post-rate change notification from parent clock */ +static int exynos850_cpuclk_post_rate_change(struct clk_notifier_data *ndata, + struct exynos_cpuclk *cpuclk) +{ + const struct exynos_cpuclk_regs * const regs = cpuclk->chip->regs; + const struct clk_hw *alt_parent = cpuclk->alt_parent; + void __iomem *base = cpuclk->base; + unsigned long flags; + u32 mux_reg; + + /* No actions are needed when switching to or from OSCCLK parent */ + if (ndata->new_rate == E850_OSCCLK || ndata->old_rate == E850_OSCCLK) + return 0; + + spin_lock_irqsave(cpuclk->lock, flags); + + /* Select main parent (PLL) for mux */ + mux_reg = readl(base + regs->mux); + writel(mux_reg & ~1, base + regs->mux); + wait_until_mux_stable(base + regs->mux, 16, 1, 0); + + spin_unlock_irqrestore(cpuclk->lock, flags); + + /* Set alt_parent rate back to max */ + return exynos850_alt_parent_set_max_rate(alt_parent, 0); +} + +/* -------------------------------------------------------------------------- */ + +/* Common round rate callback usable for all types of CPU clocks */ +static int exynos_cpuclk_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_hw *parent = clk_hw_get_parent(hw); + req->best_parent_rate = clk_hw_round_rate(parent, req->rate); + req->rate = req->best_parent_rate; + + return 0; +} + +/* Common recalc rate callback usable for all types of CPU clocks */ +static unsigned long exynos_cpuclk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + /* + * The CPU clock output (armclk) rate is the same as its parent + * rate. Although there exist certain dividers inside the CPU + * clock block that could be used to divide the parent clock, + * the driver does not make use of them currently, except during + * frequency transitions. + */ + return parent_rate; +} + +static const struct clk_ops exynos_cpuclk_clk_ops = { + .recalc_rate = exynos_cpuclk_recalc_rate, + .determine_rate = exynos_cpuclk_determine_rate, +}; + +/* + * This notifier function is called for the pre-rate and post-rate change + * notifications of the parent clock of cpuclk. + */ +static int exynos_cpuclk_notifier_cb(struct notifier_block *nb, + unsigned long event, void *data) +{ + struct clk_notifier_data *ndata = data; + struct exynos_cpuclk *cpuclk; + int err = 0; + + cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb); + + if (event == PRE_RATE_CHANGE) + err = cpuclk->chip->pre_rate_cb(ndata, cpuclk); + else if (event == POST_RATE_CHANGE) + err = cpuclk->chip->post_rate_cb(ndata, cpuclk); + + return notifier_from_errno(err); +} + +static const struct exynos_cpuclk_chip exynos_clkcpu_chips[] = { + [CPUCLK_LAYOUT_E4210] = { + .regs = &e4210_cpuclk_regs, + .pre_rate_cb = exynos_cpuclk_pre_rate_change, + .post_rate_cb = exynos_cpuclk_post_rate_change, + }, + [CPUCLK_LAYOUT_E5433] = { + .regs = &e5433_cpuclk_regs, + .pre_rate_cb = exynos5433_cpuclk_pre_rate_change, + .post_rate_cb = exynos5433_cpuclk_post_rate_change, + }, + [CPUCLK_LAYOUT_E850_CL0] = { + .regs = &e850cl0_cpuclk_regs, + .pre_rate_cb = exynos850_cpuclk_pre_rate_change, + .post_rate_cb = exynos850_cpuclk_post_rate_change, + }, + [CPUCLK_LAYOUT_E850_CL1] = { + .regs = &e850cl1_cpuclk_regs, + .pre_rate_cb = exynos850_cpuclk_pre_rate_change, + .post_rate_cb = exynos850_cpuclk_post_rate_change, + }, +}; + +/* helper function to register a CPU clock */ +static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx, + const struct samsung_cpu_clock *clk_data) +{ + const struct clk_hw *parent, *alt_parent; + struct clk_hw **hws; + struct exynos_cpuclk *cpuclk; + struct clk_init_data init; + const char *parent_name; + unsigned int num_cfgs; + int ret = 0; + + hws = ctx->clk_data.hws; + parent = hws[clk_data->parent_id]; + alt_parent = hws[clk_data->alt_parent_id]; + if (IS_ERR(parent) || IS_ERR(alt_parent)) { + pr_err("%s: invalid parent clock(s)\n", __func__); + return -EINVAL; + } + + cpuclk = kzalloc(sizeof(*cpuclk), GFP_KERNEL); + if (!cpuclk) + return -ENOMEM; + + parent_name = clk_hw_get_name(parent); + + init.name = clk_data->name; + init.flags = CLK_SET_RATE_PARENT; + init.parent_names = &parent_name; + init.num_parents = 1; + init.ops = &exynos_cpuclk_clk_ops; + + cpuclk->alt_parent = alt_parent; + cpuclk->hw.init = &init; + cpuclk->base = ctx->reg_base + clk_data->offset; + cpuclk->lock = &ctx->lock; + cpuclk->flags = clk_data->flags; + cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb; + cpuclk->chip = &exynos_clkcpu_chips[clk_data->reg_layout]; + + ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb); + if (ret) { + pr_err("%s: failed to register clock notifier for %s\n", + __func__, clk_data->name); + goto free_cpuclk; + } + + /* Find count of configuration rates in cfg */ + for (num_cfgs = 0; clk_data->cfg[num_cfgs].prate != 0; ) + num_cfgs++; + + cpuclk->cfg = kmemdup_array(clk_data->cfg, num_cfgs, sizeof(*cpuclk->cfg), + GFP_KERNEL); + if (!cpuclk->cfg) { + ret = -ENOMEM; + goto unregister_clk_nb; + } + + ret = clk_hw_register(NULL, &cpuclk->hw); + if (ret) { + pr_err("%s: could not register cpuclk %s\n", __func__, + clk_data->name); + goto free_cpuclk_data; + } + + samsung_clk_add_lookup(ctx, &cpuclk->hw, clk_data->id); + return 0; + +free_cpuclk_data: + kfree(cpuclk->cfg); +unregister_clk_nb: + clk_notifier_unregister(parent->clk, &cpuclk->clk_nb); +free_cpuclk: + kfree(cpuclk); + return ret; +} + +void __init samsung_clk_register_cpu(struct samsung_clk_provider *ctx, + const struct samsung_cpu_clock *list, unsigned int nr_clk) +{ + unsigned int idx; + + for (idx = 0; idx < nr_clk; idx++) + exynos_register_cpu_clock(ctx, &list[idx]); +} |